[PATCH] RPC: Ensure XDR iovec length is initialized correctly in call_header
Fix up call_header() so that it calls xdr_adjust_iovec().
Fix calculation of the scratch buffer length in xdr_init_encode().
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
diff --git a/net/sunrpc/xdr.c b/net/sunrpc/xdr.c
index 67b9f035..f86d1ba 100644
--- a/net/sunrpc/xdr.c
+++ b/net/sunrpc/xdr.c
@@ -616,12 +616,24 @@
void xdr_init_encode(struct xdr_stream *xdr, struct xdr_buf *buf, uint32_t *p)
{
struct kvec *iov = buf->head;
+ int scratch_len = buf->buflen - buf->page_len - buf->tail[0].iov_len;
+ BUG_ON(scratch_len < 0);
xdr->buf = buf;
xdr->iov = iov;
- xdr->end = (uint32_t *)((char *)iov->iov_base + iov->iov_len);
- buf->len = iov->iov_len = (char *)p - (char *)iov->iov_base;
- xdr->p = p;
+ xdr->p = (uint32_t *)((char *)iov->iov_base + iov->iov_len);
+ xdr->end = (uint32_t *)((char *)iov->iov_base + scratch_len);
+ BUG_ON(iov->iov_len > scratch_len);
+
+ if (p != xdr->p && p != NULL) {
+ size_t len;
+
+ BUG_ON(p < xdr->p || p > xdr->end);
+ len = (char *)p - (char *)xdr->p;
+ xdr->p = p;
+ buf->len += len;
+ iov->iov_len += len;
+ }
}
EXPORT_SYMBOL(xdr_init_encode);